gen/FreeBSD/telldir.h

   1 /*
   2  * Copyright (c) 1983, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Copyright (c) 2000
   6  *      Daniel Eischen.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $FreeBSD: src/lib/libc/gen/telldir.h,v 1.2 2001/01/24 12:59:24 deischen Exp $
  33  */
  34
  35 #ifndef _TELLDIR_H_
  36 #define _TELLDIR_H_
  37
  38 #include <sys/queue.h>
  39
  40 /*
  41  * One of these structures is malloced to describe the current directory
  42  * position each time telldir is called. It records the current magic
  43  * cookie returned by getdirentries and the offset within the buffer
  44  * associated with that return value.
  45  */
  46 struct ddloc {
  47         LIST_ENTRY(ddloc) loc_lqe; /* entry in list */
  48         long    loc_index;      /* key associated with structure */
  49         long    loc_seek;       /* magic cookie returned by getdirentries */
  50         long    loc_loc;        /* offset of entry in buffer */
  51 };
  52
  53 /*
  54  * One of these structures is malloced for each DIR to record telldir
  55  * positions.
  56  */
  57 struct _telldir {
  58         LIST_HEAD(, ddloc) td_locq; /* list of locations */
  59         long    td_loccnt;      /* index of entry for sequential readdir's */
  60 };
  61
  62 struct dirent   *_readdir_unlocked(DIR *);
  63 void            _reclaim_telldir(DIR *);
  64 void            _seekdir(DIR *, long);
  65
  66 #endif